EP0428476B1 - Tubular drill - Google Patents

Tubular drill Download PDF

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Publication number
EP0428476B1
EP0428476B1 EP90810739A EP90810739A EP0428476B1 EP 0428476 B1 EP0428476 B1 EP 0428476B1 EP 90810739 A EP90810739 A EP 90810739A EP 90810739 A EP90810739 A EP 90810739A EP 0428476 B1 EP0428476 B1 EP 0428476B1
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EP
European Patent Office
Prior art keywords
seating
intermediate ring
drilling tool
support element
length
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Expired - Lifetime
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EP90810739A
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German (de)
French (fr)
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EP0428476A1 (en
Inventor
Josef Obermeier
Rolf Spangenberg
Theodor Linke
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Hilti AG
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Hilti AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like

Definitions

  • the invention relates to a hollow drilling tool with a tubular carrier part, a cutting part arranged on the drilling direction, and between the cutting part and the carrier part provided, the cutting part carrying intermediate ring, the end faces of the two parts having such annular approaches for connecting the carrier part and the intermediate ring that the approach of one part axially overlaps the neck of the other part by a certain length.
  • Hollow drilling tools with diamond-tipped cutting parts are used for drilling in hard substrates, such as concrete, when it comes to creating accurate drill holes that are low in noise and vibration-free in any substrate that is penetrated by reinforcing irons.
  • a hollow drilling tool is known from CH-A-603 329, which has a cutting part connected to a tubular carrier part by means of an intermediate ring.
  • the intermediate ring is soldered to the carrier part and can be removed together with the cutting part after removal of the soldering and replaced by another intermediate ring to be soldered on with a new cutting part.
  • a hollow drilling tool which has a cutting part connected to a carrier part by means of an intermediate ring.
  • the intermediate ring is permanently welded to the support part.
  • the CH-A-504 266 shows a hollow diamond drill, with which it is possible to drill non-metallic workpieces to a certain depth without regularly pulling the drill out of the bore and without material loss due to core breakage.
  • This diamond hollow drill consists of a carrier part, an intermediate ring and a diamond-bearing ring.
  • the end faces of the carrier part and the intermediate ring have coordinated, annular projections that can be inserted axially into one another.
  • the intermediate ring can be connected to the carrier tube via these approaches.
  • the invention has for its object to provide a hollow drilling tool that can be equipped with new cutting parts without special equipment and without special expertise, while ensuring the functionality of the tool.
  • the object is achieved in that the radially inner shoulder of one part has a greater length than the radially outer shoulder of the other part, the length of the longer shoulder being 1.02 to 1.1 times the length of the shorter shoulder corresponds and between the radially facing lateral surfaces of the lugs there is a radial distance corresponding to 0.02 to 0.15 times the wall thickness of the carrier part, and the long lug rests with its free end face on one end face of the other part, the intermediate ring passing through Soldering facing surfaces is connected to the carrier part.
  • the axial overlap of the annular lugs ensures a concentric alignment of the carrier part and the intermediate ring by the lugs telescopically interlocking.
  • the mutually facing surfaces of the carrier part and the intermediate ring running along the shoulders, together with the facing, mutually facing surfaces of the two parts, ensure a large-area solder connection, as a result of which high holding values are achieved.
  • the soldering is done by plugging the carrier part and the intermediate ring together with the cutting part, so that the lugs mesh telescopically.
  • the area of the carrier part and the intermediate ring carrying the projections is then heated to the soldering temperature, for example by means of a ring burner.
  • a soldering rod is attached from the outside to the joint between the free end of the radially outer shoulder and the part carrying the inner shoulder and is guided in the circumferential direction of the joint.
  • the melting solder is drawn under capillary action between the facing and overlapping surfaces of the parts.
  • the surfaces to be soldered are preferably provided with a flux before the parts are put together. An existing sintered connection between the cutting part and the intermediate ring is not affected by the soldering process.
  • the radially inner shoulder of one part has a greater length than the radially outer shoulder of the other part.
  • the greater length of the inside approach ensures that when the approaches are telescopically pushed together, the inside approach runs up on an end face of the part carrying the shorter approach and there is an axial distance between the shorter approach and a facing end face on the part carrying the longer approach Absorption of solder occurs.
  • the run-up, for example circular end faces of the longer extension and one part thus exert a sealing effect during the soldering process, so that free access of solder to the inside of the carrier part and intermediate ring is prevented.
  • at least one of the abutting end faces can be provided with a knurling that creates suitable openings.
  • a suitable dimensioning of the said distance between the mutually facing end faces of the shorter extension and the one part is preferably achieved if the length of the longer extension corresponds to 1.02 to 1.1 times the length of the shorter extension.
  • a radial distance corresponding to 0.02 to 0.15 times the wall thickness of the carrier part between the mutually radially facing lateral surfaces of the approaches.
  • this radial distance allows the lugs to be plugged into one another smoothly and, on the other hand, ensures sufficient mutual concentric guiding of the lugs.
  • the radial distance is in the form of an annular gap running between the mutually facing lateral surfaces of the lugs. The annular gap favors the even distribution of the solder between the approaches.
  • the approaches advantageously have a length corresponding to 1.5 to 4 times the wall thickness of the carrier part. A tilt-free, axially parallel alignment of the carrier part and the intermediate ring is thereby achieved.
  • the approaches preferably have the same wall thickness. This ensures uniform heating of the approaches for the soldering process, which results in a uniform connection of the solder to the surfaces of the carrier part and intermediate ring to be soldered.
  • the transitions from the mutually facing end faces of the lugs and the part opposite the respective lug to the exposed lateral surfaces of the lugs and the respectively opposite part are advantageously broken. This creates pockets for holding any solder escaping from the connection point between the carrier part and the intermediate ring inwards or outwards during the soldering process.
  • the circumferential surfaces of the carrier part and the intermediate ring are thus not surmounted by solder parts which are at the most obstructive during the drilling process.
  • the outside pocket also facilitates the soldering process by being able to guide a soldering rod.
  • the radially inner shoulder is expediently arranged on the carrier part and the outer shoulder on the intermediate ring.
  • the outer shoulder which is exposed to higher wear compared to the inner shoulder, is thus exchanged, ie replaced, when the cutting part is worn, together with this and the intermediate ring.
  • the continuous cylindrical outer contour of the section of the tool behind the cutting part which is essential for good guidance of the hollow drilling tool in the borehole, is thus retained in the area between the carrier part and the intermediate ring formed by the outside attachment.
  • the cutting part 1 consists of a tubular carrier part 2, a cutting part 3 and an intermediate ring 4.
  • the cutting part 3 produced by sintering and containing diamond grains 5 is ring-shaped and divided into segments in the circumferential direction by slots 6.
  • the cutting part 3 is firmly connected to the intermediate ring 4 by sintering.
  • a concentric ring 7 on the intermediate ring 4 engages in a corresponding recess in the cutting part 3 and thus stabilizes the mutual concentric alignment.
  • a solder 8 is used to connect the intermediate ring 4 to the carrier part 2.
  • the carrier part 2 is surmounted to the rear by a connecting piece 9 which is used for clamping in a drive device.
  • carrier part 2 and intermediate ring 4 For concentric alignment of carrier part 2 and intermediate ring 4, these have mutually axially overlapping lugs 11 and 12, respectively.
  • the extension 11 provided on the carrier part 2 extends on the inside to the other extension 12 and has a greater length L than the other extension 12 with the length l.
  • the lengths L, l correspond to 1.5 to 4 times the wall thickness W of the carrier part 2.
  • the longer shoulder 11 stands with its free end face 11a on an end face 4a of the intermediate ring 4 and prevents free entry of solder 8 introduced by capillary action from the outside to the inside of the carrier part 2 and the Intermediate ring 4 out.
  • pockets 15, 16 are provided in the area of the joints between the end faces 11a, 12a of the lugs 11, 12 and the end faces 4a, 2a of the parts 4, 2 on the exposed inner and outer jacket surfaces 13, 14.
  • the pockets 15, 16 are formed by broken transitions between the end surfaces 2a / 12a, 4a / 11a and the lateral surfaces 13, 14.
  • the solder 8 can be thermally removed in a simple manner and renewed after fitting a new cutting part 3 with the intermediate ring 4.

Abstract

The hollow drill (1) has a tubular supporting part (2), a cutting part (3) and an intermediate ring (4). The intermediate ring (4) carrying the cutting part (3) is fastened releasably to the supporting part (2) by means of solder (8) for arbitrary exchange. On the intermediate ring (4) and on the supporting part (2) are annular axially overlapping extensions (11, 12), between the faces of which the solder (8) is located. <IMAGE>

Description

Die Erfindung betrifft ein Hohlbohrwerkzeug mit einem rohrförmigen Trägerteil, einem bohrrichtungsseitig angeordneten Schneidteil, sowie zwischen Schneidteil und Trägerteil vorgesehenem, das Schneidteil tragenden Zwischenring, wobei zur Verbindung von Trägerteil und Zwischenring die Stirnseiten der beiden Teile derartige ringförmige Ansätze aufweisen, dass der Ansatz des einen Teiles den Ansatz des anderen Teiles um eine bestimmte Länge axial überlappt.The invention relates to a hollow drilling tool with a tubular carrier part, a cutting part arranged on the drilling direction, and between the cutting part and the carrier part provided, the cutting part carrying intermediate ring, the end faces of the two parts having such annular approaches for connecting the carrier part and the intermediate ring that the approach of one part axially overlaps the neck of the other part by a certain length.

Zum Bohren in harten Untergründen, wie beispielsweise Beton, kommen Hohlbohrwerkzeuge mit diamantbestückten Schneidteilen zum Einsatz, wenn es darum geht, massgenaue Bohrlöcher lärmarm und erschütterungsfrei in allenfalls von Armierungseisen durchsetztem Untergrund zu erstellen.Hollow drilling tools with diamond-tipped cutting parts are used for drilling in hard substrates, such as concrete, when it comes to creating accurate drill holes that are low in noise and vibration-free in any substrate that is penetrated by reinforcing irons.

Herkömmliche Hohlbohrwerkzeuge weisen ring- oder segmentförmige Schneidteile auf, die mit einem Trägerrohr durch Versinterung, als ausreichend haltbare Methode, verbunden sind. Erlangt das Schneidteil verschleissbedingt sein Lebensende, so ist aufgrund der unlösbaren Sinterverbindung das mit hohen Kosten erstandene Werkzeug als Ganzes auszuscheiden.Conventional hollow drilling tools have ring-shaped or segment-shaped cutting parts which are connected to a carrier tube by sintering, as a sufficiently durable method. If the cutting part reaches the end of its life due to wear and tear, the tool, which was purchased at high cost, must be discarded as a whole due to the inseparable sintered connection.

Es besteht demnach mit dem Ziele der Kostensenkung das Bedürfnis, verschlissene Schneidteile von einem Trägerteil lösen und durch neue ersetzen zu können. Hierzu ist aus der CH-A-603 329 ein Hohlbohrwerkzeug bekannt, das ein mittels eines Zwischenringes mit einem rohrförmigen Trägerteil verbundenes Schneidteil aufweist. Der Zwischenring ist mit dem Trägerteil verlötet und kann zusammen mit dem Schneidteil nach Beseitigung der Verlötung abgenommen und durch einen anderen aufzulötenden Zwischenring mit neuem Schneidteil ersetzt werden.Accordingly, with the aim of reducing costs, there is a need to be able to remove worn cutting parts from a carrier part and replace them with new ones. For this purpose, a hollow drilling tool is known from CH-A-603 329, which has a cutting part connected to a tubular carrier part by means of an intermediate ring. The intermediate ring is soldered to the carrier part and can be removed together with the cutting part after removal of the soldering and replaced by another intermediate ring to be soldered on with a new cutting part.

Obwohl es sich dank der Verlötung um eine leicht lösbare Verbindung handelt, erfordert der Austausch des mit dem Schneidteil versehenen Zwischenringes beträchtlichen apparativen Aufwand und entsprechende Fachkenntnisse, um eine funktionstüchtige Verbindung und den erforderlichen Rundlauf des Werkzeugs zu erzielen.Although thanks to the soldering it is an easily detachable connection, the replacement of the intermediate ring provided with the cutting part requires considerable equipment and specialist knowledge in order to achieve a functional connection and the required concentricity of the tool.

Aus der US-A-3,736,995 ist ein Hohlbohrwerkzeug bekannt, das ein mittels eines Zwischenringes mit einem Trägerteil verbundenes Schneidteil aufweist. Der Zwischenring ist unlösbar mit dem Tragerteil verschweisst.From US-A-3,736,995 a hollow drilling tool is known which has a cutting part connected to a carrier part by means of an intermediate ring. The intermediate ring is permanently welded to the support part.

Die CH-A-504 266 zeigt einen Diamanthohlbohrer, mit dem es möglich ist, nichtmetallische Werkstücke auf eine bestimmte Tiefe ohne regelmässiges Herausziehen des Bohrers aus der Bohrung und ohne Werkstoffverluste infolge Kembruch zu bohren. Dieser Diamanthohlbohrer besteht aus einem Trägerteil, einem Zwischenring und einem diamanttragenden Ring. Die Stimseiten des Trägerteiles und des Zwischenringes weisen aufeinander abgestimmte, ringförmige Ansätze auf, die axial ineinandergesteckt werden können. Über diese Ansätze ist der Zwischenring mit dem Trägerrohr verbindbar.The CH-A-504 266 shows a hollow diamond drill, with which it is possible to drill non-metallic workpieces to a certain depth without regularly pulling the drill out of the bore and without material loss due to core breakage. This diamond hollow drill consists of a carrier part, an intermediate ring and a diamond-bearing ring. The end faces of the carrier part and the intermediate ring have coordinated, annular projections that can be inserted axially into one another. The intermediate ring can be connected to the carrier tube via these approaches.

Der Erfindung liegt die Aufgabe zugrunde, ein Hohlbohrwerkzeug zu schaffen, das sich ohne besonderen apparativen Aufwand und ohne spezielle Fachkenntnisse mit neuen Schneidteilen bestücken lässt, unter Gewährleistung der Funktionstüchtigkeit des Werkzeugs.The invention has for its object to provide a hollow drilling tool that can be equipped with new cutting parts without special equipment and without special expertise, while ensuring the functionality of the tool.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass der radial innenseitige Ansatz des einen Teiles eine grössere Länge als der radial aussenseitige Ansatz des anderen Teiles aufweist, wobei die Länge des längeren Ansatzes dem 1,02- bis 1,1-fachen der Länge des kürzeren Ansatzes entspricht und zwischen den einander radial zugewandten Mantelflächen der Ansätze ein dem 0,02 bis 0,15-fachen der Wandstärke des Trägerteiles entsprechender radialer Abstand besteht, und der längen Ansatz mit seiner freien Stirnfläche an einer Stirnfläche des anderen Teils anliegt, wobei der Zwischenring durch Verlötung einander zugewandter Flächen mit dem Trägerteil verbunden ist.According to the invention the object is achieved in that the radially inner shoulder of one part has a greater length than the radially outer shoulder of the other part, the length of the longer shoulder being 1.02 to 1.1 times the length of the shorter shoulder corresponds and between the radially facing lateral surfaces of the lugs there is a radial distance corresponding to 0.02 to 0.15 times the wall thickness of the carrier part, and the long lug rests with its free end face on one end face of the other part, the intermediate ring passing through Soldering facing surfaces is connected to the carrier part.

Durch die axiale Ueberlappung der ringförmigen Ansätze wird eine konzentrische Ausrichtung von Trägerteil und Zwischenring gewährleistet, indem die Ansätze teleskopisch ineinandergreifen. Die entlang der Ansätze verlaufenden, einander zugewandten Flächen von Trägerteil und Zwischenring gewährleisten zusammen mit stirnseitigen, einander zugewandten Flächen der beiden Teile eine grossflächige Lötverbindung, wodurch hohe Haltewerte erzielt werden.The axial overlap of the annular lugs ensures a concentric alignment of the carrier part and the intermediate ring by the lugs telescopically interlocking. The mutually facing surfaces of the carrier part and the intermediate ring running along the shoulders, together with the facing, mutually facing surfaces of the two parts, ensure a large-area solder connection, as a result of which high holding values are achieved.

Die Verlötung erfolgt, indem Trägerteil und Zwischenring mit Schneidteil zusammengesteckt werden, so dass die Ansätze teleskopisch ineinandergreifen. Der die Ansätze tragende Bereich von Trägerteil und Zwischenring wird dann beispielsweise mittels eines Ringbrenners auf Löttemperatur erwärmt. An die Stossstelle zwischen dem freien Ende des radial aussenseitigen Ansatzes und dem den innenseitigen Ansatz tragenden Teil wird von aussen ein Lötstab angesetzt und in Umfangsrichtung der Stossstelle nachgeführt. Das abschmelzende Lot zieht sich unter Kapillarwirkung zwischen die einander zugewandten und überdeckenden Flächen der Teile ein. Die zu verlötenden Flächen werden vorzugsweise vor dem Zusammenstecken der Teile mit einem Flussmittel versehen. Eine zwischen dem Schneidteil und dem Zwischenring vorhandene Sinterverbindung wird durch den Lötvorgang nicht beeinträchtigt.The soldering is done by plugging the carrier part and the intermediate ring together with the cutting part, so that the lugs mesh telescopically. The area of the carrier part and the intermediate ring carrying the projections is then heated to the soldering temperature, for example by means of a ring burner. A soldering rod is attached from the outside to the joint between the free end of the radially outer shoulder and the part carrying the inner shoulder and is guided in the circumferential direction of the joint. The melting solder is drawn under capillary action between the facing and overlapping surfaces of the parts. The surfaces to be soldered are preferably provided with a flux before the parts are put together. An existing sintered connection between the cutting part and the intermediate ring is not affected by the soldering process.

Der radial innenseitige Ansatz des einen Teiles weist eine grössere Länge als der radial aussenseitige Ansatz des anderen Teiles auf. Durch die grössere Länge des innenseitigen Ansatzes wird erreicht, dass beim teleskopischen Ineinanderschieben der Ansätze der innenseitige Ansatz an einer Stirnfläche des den kürzeren Ansatz tragenden Teiles aufläuft und zwischen dem kürzeren Ansatz und einer diesem zugewandten Stirnfläche an dem den längeren Ansatz tragenden Teil ein axialer Abstand zur Aufnahme von Lot entsteht. Die aufeinander aufgelaufenen, beispielsweise kreisringförmigen Stirnflächen des längeren Ansatzes und des einen Teiles üben so beim Lötvorgang Dichtwirkung aus, so dass ein freier Zutritt von Lot zur Innenseite von Trägerteil und Zwischenring unterbunden wird. Um allenfalls ein Austreten des Flussmittels zu ermöglichen, kann wenigstens eine der aufeinandertreffenden Stirnflächen mit einer dafür geeignete Durchtrittsöffnungen schaffenden Rändelung versehen sein. Eine geeignete Dimensionierung des besagten Abstandes zwischen den einander zugewandten Stirnflächen des kürzeren Ansatzes und dem einen Teil wird bevorzugt erreicht, wenn die Länge des längeren Ansatzes dem 1,02- bis 1,1-fachen der Länge des kürzeren Ansatzes entspricht.The radially inner shoulder of one part has a greater length than the radially outer shoulder of the other part. The greater length of the inside approach ensures that when the approaches are telescopically pushed together, the inside approach runs up on an end face of the part carrying the shorter approach and there is an axial distance between the shorter approach and a facing end face on the part carrying the longer approach Absorption of solder occurs. The run-up, for example circular end faces of the longer extension and one part thus exert a sealing effect during the soldering process, so that free access of solder to the inside of the carrier part and intermediate ring is prevented. In order to allow the flux to emerge, at least one of the abutting end faces can be provided with a knurling that creates suitable openings. A suitable dimensioning of the said distance between the mutually facing end faces of the shorter extension and the one part is preferably achieved if the length of the longer extension corresponds to 1.02 to 1.1 times the length of the shorter extension.

Zwischen den einander radial zugewandten Mantelflächen der Ansätze besteht ein dem 0,02- bis 0,15-fachen der Wandstärke des Trägerteiles entsprechender radialer Abstand. Dieser radiale Abstand erlaubt einerseits ein leichtgängiges Ineinanderstecken der Ansätze und stellt andererseits ein ausreichendes gegenseitiges konzentrisches Führen der Ansätze sicher. Der radiale Abstand liegt in Form eines zwischen den einander zugewandten Mantelflächen der Ansätze umlaufenden Ringspaltes vor. Der Ringspalt begünstigt die gleichmässige Verteilung des Lotes zwischen den Ansätzen.There is a radial distance corresponding to 0.02 to 0.15 times the wall thickness of the carrier part between the mutually radially facing lateral surfaces of the approaches. On the one hand, this radial distance allows the lugs to be plugged into one another smoothly and, on the other hand, ensures sufficient mutual concentric guiding of the lugs. The radial distance is in the form of an annular gap running between the mutually facing lateral surfaces of the lugs. The annular gap favors the even distribution of the solder between the approaches.

Die Ansätze weisen mit Vorteil eine dem 1,5- bis 4-fachen der Wandstärke des Trägerteiles entsprechende Länge auf. Dadurch wird eine verkippungsfreie achsparallele Ausrichtung von Trägerteil und Zwischenring erreicht.The approaches advantageously have a length corresponding to 1.5 to 4 times the wall thickness of the carrier part. A tilt-free, axially parallel alignment of the carrier part and the intermediate ring is thereby achieved.

Die Ansätze weisen bevorzugt eine gleiche Wandstärke auf. Dadurch wird eine gleichmässige Erwärmung der Ansätze für den Lötvorgang gewährleistet, was eine gleichmässige Verbindung des Lotes mit den zu verlötenden Flächen von Trägerteil und Zwischenring zur Folge hat.The approaches preferably have the same wall thickness. This ensures uniform heating of the approaches for the soldering process, which results in a uniform connection of the solder to the surfaces of the carrier part and intermediate ring to be soldered.

Mit Vorteil sind die Uebergänge von den einander zugewandten Stirnflächen der Ansätze und des dem jeweiligen Ansatz gegenüberliegenden Teiles zu den freiliegenden Mantelflächen der Ansätze und des jeweils gegenüberliegenden Teiles gebrochen. Dadurch entstehen Taschen zur Aufnahme von allfälligen, aus der Verbindungsstelle zwischen dem Trägerteil und dem Zwischenring nach innen oder aussen beim Lötvorgang austretenden Lotes. Die Mantelflächen von Trägerteil und Zwischenring werden so nicht von allenfalls beim Bohrvorgang hinderlichen Lot-Teilen überragt. Die aussenseitig Tasche erleichtert zudem den Lötvorgang, indem sie die Führung eines Lötstabes übernehmen kann.The transitions from the mutually facing end faces of the lugs and the part opposite the respective lug to the exposed lateral surfaces of the lugs and the respectively opposite part are advantageously broken. This creates pockets for holding any solder escaping from the connection point between the carrier part and the intermediate ring inwards or outwards during the soldering process. The circumferential surfaces of the carrier part and the intermediate ring are thus not surmounted by solder parts which are at the most obstructive during the drilling process. The outside pocket also facilitates the soldering process by being able to guide a soldering rod.

Der radial innenseitige Ansatz ist zweckmässig am Trägerteil und der aussenseitige Ansatz am Zwischenring angeordnet. Der gegenüber dem innenseitigen Ansatz höherem Verschleiss ausgesetzte aussenseitige Ansatz wird so bei verschlissenem Schneidteil jeweils zusammen mit diesem und dem Zwischenring ausgetauscht, dh miterneuert. Die für gute Führung des Hohlbohrwerkzeugs im Bohrloch massgebliche, kontinuierlich zylindrische Aussenkontur des hinter dem Schneidteil liegenden Abschnittes des Werkzeugs bleibt so auch in dem durch den aussenseitigen Ansatz gebildeten Bereich zwischen Trägerteil und Zwischenring erhalten.The radially inner shoulder is expediently arranged on the carrier part and the outer shoulder on the intermediate ring. The outer shoulder, which is exposed to higher wear compared to the inner shoulder, is thus exchanged, ie replaced, when the cutting part is worn, together with this and the intermediate ring. The continuous cylindrical outer contour of the section of the tool behind the cutting part, which is essential for good guidance of the hollow drilling tool in the borehole, is thus retained in the area between the carrier part and the intermediate ring formed by the outside attachment.

Die Erfindung wird nachstehend anhand einer Zeichnung, die ein Ausführungsbeispiel wiedergibt, näher erläutert. Es zeigen:

Fig. 1
ein Hohlbohrwerkzeug, teilweise im Längsschnitt;
Fig. 2
einen Teil des in Fig. 1 geschnittenen Bereiches des Hohlbohrwerkzeugs, in vergrösserter Darstellung.
The invention is explained below with reference to a drawing which shows an embodiment. Show it:
Fig. 1
a hollow drilling tool, partly in longitudinal section;
Fig. 2
a part of the section of FIG. 1 of the hollow drilling tool, in an enlarged view.

Das in Fig. 1 gesamthaft dargestellte Hohlbohrwerkzeug 1 besteht aus einem rohrförmigen Trägerteil 2, einem Schneidteil 3 und einem Zwischenring 4. Das durch Sinterung hergestellte, Diamantkörner 5 beinhaltende Schneidteil 3 ist ringförmig ausgebildet und durch Schlitze 6 in Umfangsrichtung in Segmente unterteilt. Durch Versinterung ist das Schneidteil 3 mit dem Zwischenring 4 fest verbunden. Ein konzentrischer Ring 7 am Zwischenring 4 greift in eine korrespondierende Ausnehmung des Schneidteiles 3 ein und stabilisiert so die gegenseitige konzentrische Ausrichtung. Der Verbindung des Zwischenringes 4 mit dem Trägerteil 2 dient ein Lot 8. Das Trägerteil 2 wird nach hinten von einem dem Einspannen in ein Antriebsgerät dienenden Anschlussstutzen 9 überragt.1 consists of a tubular carrier part 2, a cutting part 3 and an intermediate ring 4. The cutting part 3 produced by sintering and containing diamond grains 5 is ring-shaped and divided into segments in the circumferential direction by slots 6. The cutting part 3 is firmly connected to the intermediate ring 4 by sintering. A concentric ring 7 on the intermediate ring 4 engages in a corresponding recess in the cutting part 3 and thus stabilizes the mutual concentric alignment. A solder 8 is used to connect the intermediate ring 4 to the carrier part 2. The carrier part 2 is surmounted to the rear by a connecting piece 9 which is used for clamping in a drive device.

Zur konzentrischen Ausrichtung von Trägerteil 2 und Zwischenring 4 weisen diese sich gegenseitig axial überlappende Ansätze 11 bzw 12 auf. Der am Trägerteil 2 vorgesehene Ansatz 11 erstreckt sich innenseitig zum anderen Ansatz 12 und weist eine grössere Länge L als der andere Ansatz 12 mit der Länge l auf. Die Längen L, l entsprechen dem 1,5- bis 4-fachen der Wandstärke W des Trägerteiles 2. Zwischen den einander radial zugewandten Mantelflächen der Ansätze 11, 12 besteht ein radialer Abstand a in Form eines Ringspaltes. Entlang des hier aus Verdeutlichungsgründen vergrössert dargestellten radialen Abstandes a, der in Wirklichkeit dem 0,02- bis 0,15-fachen der Wandstärke W entspricht, und entlang der einander zugewandten und zueinander in geringfügigem axialem Abstand stehenden Stirnflächen 12a, 2a des kürzeren Ansatzes 12 und des Trägerteiles 2 erstreckt sich das Lot 8. Der längere Ansatz 11 steht mit seiner freien Stirnfläche 11a an einer Stirnfläche 4a des Zwischenringes 4 auf und unterbindet ein freies Eintreten von durch Kapillarwirkung von der Aussenseite her eingebrachten Lotes 8 zur Innenseite des Trägerteiles 2 und des Zwischenringes 4 hin.For concentric alignment of carrier part 2 and intermediate ring 4, these have mutually axially overlapping lugs 11 and 12, respectively. The extension 11 provided on the carrier part 2 extends on the inside to the other extension 12 and has a greater length L than the other extension 12 with the length l. The lengths L, l correspond to 1.5 to 4 times the wall thickness W of the carrier part 2. There is a radial distance a in the form of an annular gap between the mutually radially facing lateral surfaces of the lugs 11, 12. Along the radial distance a, which is shown enlarged for clarity reasons and which in reality corresponds to 0.02 to 0.15 times the wall thickness W, and along the mutually facing end faces 12a, 2a of the shorter extension 12 which are at a slight axial distance from one another and the carrier part 2 extends the solder 8. The longer shoulder 11 stands with its free end face 11a on an end face 4a of the intermediate ring 4 and prevents free entry of solder 8 introduced by capillary action from the outside to the inside of the carrier part 2 and the Intermediate ring 4 out.

Zur Aufnahme allenfalls austretenden Lotes 8 sind im Bereich der Stossstellen zwischen den Stirnflächen 11a, 12a der Ansätzen 11, 12 und den Stirnflächen 4a, 2a der Teile 4, 2 an den freiliegenden inneren und äusseren Mantelflächen 13, 14 Taschen 15, 16 vorgesehen. Die Taschen 15, 16 sind durch gebrochene Uebergänge zwischen den Stirnflächen 2a/12a, 4a/11a und den Mantelflächen 13, 14 gebildet.To accommodate any leaking solder 8, pockets 15, 16 are provided in the area of the joints between the end faces 11a, 12a of the lugs 11, 12 and the end faces 4a, 2a of the parts 4, 2 on the exposed inner and outer jacket surfaces 13, 14. The pockets 15, 16 are formed by broken transitions between the end surfaces 2a / 12a, 4a / 11a and the lateral surfaces 13, 14.

Zum Austausch des allenfalls verschlissenen Schneidteiles 3 mit dem diesen tragenden Zwischenring 4 kann das Lot 8 auf einfache Weise thermisch beseitigt und nach Aufsetzen eines neuen Schneidteiles 3 mit Zwischenring 4 erneuert werden.In order to replace the possibly worn cutting part 3 with the intermediate ring 4 carrying it, the solder 8 can be thermally removed in a simple manner and renewed after fitting a new cutting part 3 with the intermediate ring 4.

Claims (5)

  1. Hollow drilling tool (1) comprising a tubular support element (2), a cutting element (3) arranged at the cutting side, and an intermediate ring (4), which is provided between the cutting element (3) and the support element (2) and which carries the cutting element (3), and that for the purpose of connecting support element (2) and intermediate ring (4) the ends of both elements have seating surfaces (11, 12), which are annular in such a manner that the seating (11) of the one element (2 or 4) axially overlaps the seating (12) of the other element (4 or 2) by a specified length, characterised in that the radially interior seating (11 of the one element (2 or 4) has a greater length (L) than the radially exterior seating (12) of the other element (4 or 2), in which respect the length (L) of the longer seating (11) equals between 1.02 and 1.1 times the length (1) of the shorter seating (12), and that there is a radial distance (a) between the casing surfaces of the seatings (11, 12) which are oriented radially towards each other which equals between 0.02 and 0.15 times the wall thickness (W) of the support element (2), and the longer seating (11) abuts with its free end surface (11a) an end surface (4a) of the other element (2 or 4), and that the intermediate ring (4) is connected to the support element (2) by soldering together surfaces which are oriented towards each other.
  2. Hollow drilling tool according to claim 1, cha racterised in that the length of the seatings (11, 12) equals between 1.5 and 4 times the wall thickness (W) of the support element (2).
  3. Hollow drilling tool according to claim 1 or 2, characterised in that the seatings (11, 12) are of equal wall thickness.
  4. Hollow drilling tool according to one of claims 1 to 3, characterised in that the transitions of end surfaces which are oriented towards each other (11a, 12a, 4a, 2a) of the seatings (11, 12) and of the element (4, 2) positioned opposite the respective seating (11, 12) to the exposed casing surfaces (13, 14) of the seatings (11, 12) and of a respective opposite elements (4, 2) are broken.
  5. Hollow drilling tool according to one of claims 1 to 4, characterised in that the radially internal seating (11) is arranged on the support element (2), and the external seating (12) is arranged on the intermediate ring (4).
EP90810739A 1989-11-13 1990-09-27 Tubular drill Expired - Lifetime EP0428476B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3937697A DE3937697A1 (en) 1989-11-13 1989-11-13 HOLLOW DRILLING TOOL
DE3937697 1989-11-13

Publications (2)

Publication Number Publication Date
EP0428476A1 EP0428476A1 (en) 1991-05-22
EP0428476B1 true EP0428476B1 (en) 1994-06-08

Family

ID=6393415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90810739A Expired - Lifetime EP0428476B1 (en) 1989-11-13 1990-09-27 Tubular drill

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Country Link
US (1) US5082070A (en)
EP (1) EP0428476B1 (en)
JP (1) JP2907525B2 (en)
AT (1) ATE106793T1 (en)
DE (2) DE3937697A1 (en)

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EP4015120A1 (en) 2020-12-15 2022-06-22 Hilti Aktiengesellschaft Method for exchanging drill segments of a drill coring bit and cutting section for a drill coring bit

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EP4015120A1 (en) 2020-12-15 2022-06-22 Hilti Aktiengesellschaft Method for exchanging drill segments of a drill coring bit and cutting section for a drill coring bit
WO2022128570A1 (en) 2020-12-15 2022-06-23 Hilti Aktiengesellschaft Method for replacing the drill segments of a core drill bit, and cutting portion for a core drill bit

Also Published As

Publication number Publication date
DE59006030D1 (en) 1994-07-14
DE3937697A1 (en) 1991-05-16
JPH03154703A (en) 1991-07-02
JP2907525B2 (en) 1999-06-21
ATE106793T1 (en) 1994-06-15
US5082070A (en) 1992-01-21
EP0428476A1 (en) 1991-05-22

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